Snoozer Lookout II Pet Car Seat - Small Comfortable foam form Simulated lamb's wool interior Connection strap included for the seat belt to join the harness Available in a variety of fabric options Comfortable foam form Simulated lambs wool interior Connection strap included for the seat belt to join the harness Available in a variety of fabric options Small: 19H X 15W X 17L (outside)/ 12W x 14L (inside)- Recommended for pets up to 18 lbs. Medium: 19H X 22W X 17L (outside)/ 18W x 14L (inside)- Recommended for pets up to 25 lbs. Large: 19H X 30W X 17L (outside)/ 25W x 14L (inside)- Recommended for pets up to 34 lbs.